Long nail used in brutal onslaught (5)

I believe the answer is:

talon

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'long nail' is the definition.
'talon' can be an answer for 'nail' (thesaurus). I'm unsure of the 'long' bit.

'in brutal onslaught' is the wordplay.
'in' indicates the answer is hidden within the clue.
'TALON' is hidden in the letters of 'brutal onslaught'.

'used' is the link.

Can you help me to learn more?

(Other definitions for talon that I've seen before include "Bird of prey's claw" , "Hooked claw; cards left after deal" , "Raptor's claw" , "One may be grabbing" , "Claw of a bird of prey" .)

I've seen this clue in The Sun.

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